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A rhodamine B-based colorimetric chemosensor for sensitive and selective detection of Cu2+ : Test strip analysis and density functional theory / Jae Sung Heo in COLORATION TECHNOLOGY, Vol. 139, N° 1 (02/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 1 (02/2023) . - p. 4-15 Titre : A rhodamine B-based colorimetric chemosensor for sensitive and selective detection of Cu2+ : Test strip analysis and density functional theory Type de document : texte imprimé Auteurs : Jae Sung Heo, Auteur ; Dongkyun Gil, Auteur ; Jae Jun Lee, Auteur ; Cheal Kim, Auteur Année de publication : 2023 Article en page(s) : p. 4-15 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Capteurs chimiques Colorimétrie Ions cuivre Rhodamine Index. décimale : 535.6 Couleur Résumé : We designed a rhodamine B-based colorimetric chemosensor BHSO ((Z)-3′,6′-bis(diethylamino)-2-(2-(((8-hydroxy-2,3,6,7-tetrahydro-1H,5H-pyrido[3,2,1-ij]quinolin-9-yl)methylene)amino)ethyl)spiro[isoindoline-1,9′-xanthen]-3-one) for detecting Cu2+. In the presence of Cu2+, BHSO caused a colour variation from colourless to bright orange. The limit of detection for Cu2+ towards BHSO was 0.73 μM. The binding of BHSO to Cu2+ was analysed as a 1:1 ratio through a Job plot and electrospray ionisation mass spectrometry. BHSO can detect readily Cu2+ with a test strip by colorimetric variation. The detecting process of Cu2+ by BHSO was represented by ultraviolet-visible titration, electrospray ionisation mass spectrometry, proton nuclear magnetic resonance titration, Job plot and density functional theory calculations. Note de contenu : - EXPERIMENTAL : Materials and equipment - Synthesis of ABSO - Synthesis of BHSO - UV-vis titration of BHSO with Cu2+ - Job plot - 1H NMR titration - Inhibition test - Test strip - Calculations for BHSO and BHSO-Cu2+ - RESULTS AND DISCUSSION : Spectroscopic test of BHSO with Cu2+ - Theoretical calculation - Table 1 : Examples of colorimetric chemosensors for detecting Cu2+ based on rhodamine B derivatives that are linked by ethylenediamine DOI : https://doi.org/10.1111/cote.12633 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12633 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39201 [article]

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Effect of grey component replacement processing and varnishing on the light fastness of colours on cardboard prints / Tomislav Cigula in COLORATION TECHNOLOGY, Vol. 139, N° 1 (02/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 1 (02/2023) . - p. 16-27 Titre : Effect of grey component replacement processing and varnishing on the light fastness of colours on cardboard prints Type de document : texte imprimé Auteurs : Tomislav Cigula, Auteur ; Tamara Tomasegovic, Auteur ; Davor Donevski, Auteur ; Tomislav Hudika, Auteur Année de publication : 2023 Article en page(s) : p. 16-27 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Emballages Fourier, Spectroscopie infrarouge à transformée de Impression en couleur Mesure Papier et carton couché Photostabilité Réflexion totale atténuée Résistance à l'abrasion Solidité de la couleur Vernis en phase aqueuse Index. décimale : 535.6 Couleur Résumé : The visual appearance of packaging is one of its most important features. Electromagnetic irradiation causes a change in colour and often leads to colour fading (ie, to diminished visual appearance of a printed product). This research study aimed to determine the combined effect of grey component replacement image processing and varnishing on the protection of prints' appearance when exposed to accelerated ageing. For that purpose, two test charts were printed in a lithographic press and coated with water-based and ultraviolet-curable varnish before exposing them to xenon light. The prepared prints were evaluated by determining the tone values and colour difference, as well as the rub and abrasion resistance. In addition, Fourier Transform–infrared-attenuated total reflectance spectra were recorded to detect possible chemical changes caused by the (AcA). The results showed that the investigated period of (AcA) caused significant differences in the tone values of yellow, while the other primary colours proved to be more resistant. The water-based varnish provided better protection than the ultraviolet-curable varnish. The grey component replacement image processing diminished the colour difference caused by (AcA) on all the prepared print samples, and was particularly detected in tertiary colours containing the mid-range tone values of yellow (34%-68%). Both varnishes improved the rub resistance of aged prints, but only ultraviolet-curable varnish improved the abrasion resistance of both the unaged and the aged prints. In conclusion, applying varnish to prints ensured enhanced rub and abrasion resistance and diminished the colour change caused by (AcA). Finally, improved resistance to colour change was achieved by processing images with the grey component replacement method. Note de contenu : - EXPERIMENTAL : Materials and preparation of samples - Methods of measurement and analysis - RESULTS AND DISCUSSION : TVs of process colours and colour difference of tertiary colours - Rub and abrasion resistance of the prints - FTIR-ATR spectroscopy DOI : https://doi.org/10.1111/cote.12630 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12630 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39202 [article]

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The use of Monte Carlo simulation to evaluate the optical properties of polyester fabric treated with titanium dioxide nanopigments / Laleh Asadi in COLORATION TECHNOLOGY, Vol. 139, N° 1 (02/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 1 (02/2023) . - p. 28-44 Titre : The use of Monte Carlo simulation to evaluate the optical properties of polyester fabric treated with titanium dioxide nanopigments Type de document : texte imprimé Auteurs : Laleh Asadi, Auteur ; Ali Shams Nateri, Auteur Année de publication : 2023 Article en page(s) : p. 28-44 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Coefficient de diffusion Un coefficient de diffusion est une grandeur caractéristique du phénomène de diffusion de la matière. Le coefficient de diffusion mesure le rapport entre le flux molaire dû à la diffusion moléculaire, et le gradient de concentration de l'espèce chimique considérée (ou, plus généralement, de la variable d'effort entraînant cette diffusion), comme formulé par la loi de Fick. Dioxyde de titane Enduction textile Fibres textiles -- Propriétés optiques Lumière -- Diffusion Mie, Diffusion de Monte-Carlo, Méthode de Pigments Pigments inorganiques Spectroscopie de réflectance Textiles et tissus -- Propriétés optiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : The current study utilises Monte Carlo simulation and Mie scattering theory to estimate the reflectance spectra of fabric coated with titanium dioxide nanopigments of various diameters and concentrations. Image processing was carried out and experimental data were gathered to evaluate the performance of Monte Carlo simulation. The distribution and location of the nanopigments on the surface of fabric were determined using the Monte Carlo method. Reflection of the fabric was calculated based on Monte Carlo simulation with the partitive mixing method and Mie theory. According to the experimental and simulation results, the reflectance of coated samples was increased by increasing the concentration and number of titanium dioxide nanoparticles. There was a good match between the results obtained by Monte Carlo simulation and the experimental results. For coated samples (dTiO2: 500 nm), the root mean square error between measured and predicted reflectance by the Monte Carlo and partitive mixing method and by Monte Carlo and Mie theory was 0.022 and 0.0078, respectively. The results indicate that the performance of the Monte Carlo and Mie method was better than that of the Monte Carlo and partitive mixing method. According to t-test analysis, there was no statistically significant difference between the experimental data and Monte Carlo simulation. Note de contenu : - EXPERIMENTAL : Materials - Polyester fabric coating - Characterisation - MODEL DESCRIPTION : MC and the partitive mixing method - MC and the Mie method - Table 1 : For polyester fabric, the percentages of uncoated surface and surface coated with titanium dioxide (TiO2) based on the image processing system - Table 2 : CIELab and colour difference (∆E) values for the uncoated (raw fabric) sample and samples coated with titanium dioxide (TiO2) - Table 3 : Scattering coefficient values for titanium dioxide nanopigments with average diameters of 30, 50, 150, 250 and 500 nm - Table 4 : Forward and backward light scattering of titanium dioxide (TiO2) nanoparticles based on Mie theory - Table 5 : Forward and backward light scattering of titanium dioxide (TiO2) nanoparticles based on image processing - Table 6 : Percentages of empty and occupied particles using the Monte Carlo method for different hypothetical numbers of titanium dioxide (TiO2) nanoparticles - Table 7 : Estimated percentages of empty and occupied particles using the Monte Carlo method for actual numbers of titanium dioxide (TiO2) nanoparticles - Table 8 : Area occupied on the fabric surface by single, double and multiple titanium dioxide (TiO2) nanopigments - Table 9 : L*, a*, b* and ∆E values for samples with different numbers of titanium dioxide (TiO2) nanopigments - Table 10 : CIELab and ∆E values and the root mean square error (RMSE) for reflectance predictions using the Monte Carlo and partitive mixing method - Table 11 : CIELab and ∆E values and the root mean square error (RMSE) for reflectance predictions using the Monte Carlo and Mie method - Table 12 : T-stat and P values for the experimental and Monte Carlo simulation results DOI : https://doi.org/10.1111/cote.12632 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12632 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39203 [article]

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Horseradish peroxidase-mediated polyethylene glycol-templated polymerisation of gallic acid and pyrrole to improve the functionalisation and dyeing properties of silk fabrics / Na-won Baek in COLORATION TECHNOLOGY, Vol. 139, N° 1 (02/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 1 (02/2023) . - p. 45-56 Titre : Horseradish peroxidase-mediated polyethylene glycol-templated polymerisation of gallic acid and pyrrole to improve the functionalisation and dyeing properties of silk fabrics Type de document : texte imprimé Auteurs : Na-won Baek, Auteur ; Dan Wang, Auteur ; Xun Zhang, Auteur ; Jie Wang, Auteur ; Xue-rong Fan, Auteur Année de publication : 2023 Article en page(s) : p. 45-56 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Polyéthylène glycol Polymérisation Polymérisation enzymatique Polyphénols Les polyphénols constituent une famille de molécules organiques largement présente dans le règne végétal. Ils sont caractérisés, comme l’indique le nom, par la présence d'au moins deux groupes phénoliques associés en structures plus ou moins complexes, généralement de haut poids moléculaire. Ces composés sont les produits du métabolisme secondaire des plantes. Les polyphénols prennent une importance croissante, notamment grâce à leurs effets bénéfiques sur la santé. En effet, leur rôle d’antioxydants naturels suscite de plus en plus d'intérêt pour la prévention et le traitement du cancer, des maladies inflammatoires, cardiovasculaires et neurodégénératives. Ils sont également utilisés comme additifs pour les industries agroalimentaire, pharmaceutique et cosmétique "Ils ont tous en commun la présence d'un ou plusieurs cycles benzéniques portant une ou plusieurs fonctions hydroxyles". La désignation "polyphénols" est consacrée par l'usage et, alors qu'elle ne devrait concerner que les molécules portant plusieurs fonctions hydroxyle phénolique, elle est habituellement utilisée pour l'ensemble de ces composés. Les polyphénols naturels regroupent donc un vaste ensemble de substances chimiques comprenant au moins un noyau aromatique, portant un ou plusieurs groupes hydroxyle, en plus d’autres constituants. Il y a quatre principales familles de composés phénoliques : les acides phénoliques (catéchol, acide gallique, acide protocatéchique), les flavones, l'acide chlorogénique et les quinones. Ils peuvent aller de molécules simples, comme les acides phénoliques, à des composés hautement polymérisés, de plus de trente mille daltons, comme les tanins (acide tannique). Les polyphénols sont communément subdivisés en phénols simples, acides phénoliques et coumarines, en naphtoquinones, en stilbénoïdes (deux cycles en C6 liés par deux atomes de carbone), en flavonoïdes, isoflavonoïdes et anthocyanes, et en formes polymérisées : lignanes, lignines, tanins condensés. Ces squelettes carbonés de base sont issus du métabolisme secondaire des plantes, élaborés par la voie du shikimate. Les polyphénols sont présents dans diverses substances naturelles : sous forme d'anthocyanine dans les fruits rouges, le vin rouge (en relation avec les tanins, phénomène du "paradoxe français"), sous forme de proanthocyanidines dans le chocolat et le vin, d'acides caféoylquinique et féruloylquinique dans le café, de flavonoïdes dans les agrumes, et sous forme de catéchines comme le gallate d'épigallocatéchine dans le thé vert, de quercétine dans les pommes, les oignons, le vin rouge, etc. D'après une étude réalisée avec des volontaires via Internet, les sources alimentaires de polyphénols sont principalement le café (36,9 %), le thé — vert ou noir — (33,6 %), le chocolat pour son cacao (10,4 %), le vin rouge (7,2 %) et les fruits (6,7 %)18. Parmi les fruits, les polyphénols, très présents dans toutes les pommes, sont encore plus concentrés dans les pommes à cidre (riches en tanin), qui peuvent en contenir jusqu'à quatre fois plus : c'est une biodiversité qui se manifeste en richesse aussi bien qualitativement que quantitativement en polyphénols. (Wikipedia) Polypyrroles Soie et constituants Solidité de la couleur Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : Silk fabrics treated with gallic acid/pyrrole (PGA/PPy) complexes polymerised using horseradish peroxidase have higher electrochemical activity than silk fabrics dyed with gallic acid alone. However, the degree of polymerisation decreases. As a result, the ultraviolet (UV) protection and fastness of the silk fabric were lowered. To solve this problem, we studied the degree of polymerisation of the complex and the functionality of dyed silk fabrics by applying a polyethylene glycol (PEG) template to the enzymatic polymerisation of PGA/PPy. The polymerisation mechanism of the complexes was analysed in detail using UV-visible spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, and high-performance liquid chromatography electrospray ionisation mass spectrometry (HPLC-ESI-MS). Consequently, the PGA/PPy/PEG complex has a higher degree of polymerisation than the PGA/PPy prepared without PEG, indicating that the PEG template can promote the polymerisation of PGA and PPy. As a result, we found that the presence of the PEG template improved the thermal stability and UV protection function of the dyed silk fabric, but did not impair the electrochemical activity of silk fabric. As a result of analysing the colour depth, it exhibited a higher K/S value compared to the dyed silk fabric in the absence of PEG. Additionally, its colour fastness was improved. Note de contenu : - MATERIALS AND METHODS : Reagents and materials - Enzymatic oxidative polymerisation of gallic acid - Dyeing process of silk fabrics - Characterisation of polymers - Characterisation of silk fabrics - RESULTS AND DISCUSSION : Characterisation of PGA, PFA and the PGA/PPy, PFA/PPy complexes - Properties of functionalised silk fabrics - - Table 1 : Possible mass-to-charge (m/z) assignments for PGA, PGA/PPy and PGA/PPy/PEG - Table 2 : Anti-ultraviolet (UV) activity of the treated silk fabrics - Table 3 : CIELab values obtained for the dyed silk samples - Table 4 : The colour fastness of the dyed silk fabric DOI : https://doi.org/10.1111/cote.12634 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12634 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39204 [article]

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Synthesis and properties of poly(styrene-co-maleic acid) macromolecular reactive dyes / Fuchun Wang in COLORATION TECHNOLOGY, Vol. 139, N° 1 (02/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 1 (02/2023) . - p. 57-67 Titre : Synthesis and properties of poly(styrene-co-maleic acid) macromolecular reactive dyes Type de document : texte imprimé Auteurs : Fuchun Wang, Auteur ; Ma Wei, Auteur ; Bingtao Tang, Auteur ; Shufen Zhang, Auteur Année de publication : 2023 Article en page(s) : p. 57-67 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Colorants -- Synthèse Colorants réactifs Copolymère styrène acide maléique Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Fixation (chimie) Solidité de la teinture Teinture -- Fibres textiles Index. décimale : 667.2 Colorants et pigments Résumé : To obtain a new type of macromolecular reactive dye with high fixation and good light fastness, poly(styrene-co-maleic acid) was synthesised by co-polymerisation of styrene and maleic anhydride, then, through nitration, reduction, diazotisation and coupling reaction, novel macromolecular reactive dyes were prepared with a solubility greater than 60 g/L. The dyes were used to dye cotton fabrics; the results showed their fixation was more than 92%, and both the rub and wash fastness of the dyes were good. The light fastness of the red and blue dyes with the ethoxy group on melamine was grade 4, and for the yellow dye reached grade 5. The poly(styrene-co-maleic acid) macromolecular reactive dyes exhibit very good application prospects in practice. Note de contenu : - EXPERIMENTAL : Reagents and instruments - Synthesis of aromatic amine polymers (PSMA-NH2) - Synthesis of precursor of macromolecular reactive dyes - Synthesis of macromolecular reactive dyes - Dyeing and colour fixation - RESULTS AND DISCUSSION : Synthesis of PSMA-NH2 - Synthesis of precursor of macromolecular reactive dyes - Preparation of macromolecular reactive dyes - Dyeing performance of the macromolecular reactive dyes - Table 1 : Condensation reactions of cyanuric chloride - Table 2 : Structures and characterisation of the precursors - Table 3 : Structures and spectral data of the macromolecular reactive dyes - Table 4 : Dye fixation (F), K/S and fastness of macromolecular reactive dyes - Table 5 : Performance comparison of small and macromolecular dyes with similar structures DOI : https://doi.org/10.1111/cote.12631 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12631 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39205 [article]

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A new method for determination of the relative colour strength of dye based on new colour depth formula. Part II: application to different batches of colourant / Wanzi Xie in COLORATION TECHNOLOGY, Vol. 139, N° 1 (02/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 1 (02/2023) . - p. 68-78 Titre : A new method for determination of the relative colour strength of dye based on new colour depth formula. Part II: application to different batches of colourant Type de document : texte imprimé Auteurs : Wanzi Xie, Auteur ; Hongbo Wang, Auteur ; Hongying Yang, Auteur ; Jingjing Zhang, Auteur ; Mengyuan Qi, Auteur Année de publication : 2023 Article en page(s) : p. 68-78 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Analyse Colorimétrie Réflectance Saturation (colorimétrie) Index. décimale : 667.3 Teinture et impression des tissus Résumé : As a standard for the evaluation of relative colour strength (RCS) of dye, AATCC EP-6 (SWL [K/S], SUM, and WSUM) has been widely used, while its limitations are often overlooked by people. In Part I of this study, the new method Yangn (CSV1, CSV2, and CSV3) for the determination of RCS were proposed, Yangn and AATCC EP-6 were tested using the different types of disperse dyes that have approximate hues. However, the calculations of RCS for the same dyes produced in different batches were also necessary, therefore, this article (Part II) focuses on it. The HL series dyes produced in 2020 and 2021 were used to test Yangn and AATCC EP-6. The same results as Part I, the colour strength values calculated by SWL, SUM, and WSUM were inconsistent. Furthermore, in the methods of AATCC EP-6, the colour strength values calculated by WSUM should be at least rounded to four decimal places to avoid false calculation; the value of Yangn only need to be rounded to two decimal places. For the RCS of the same dyes produced in different batches, the methods of AATCC EP-6 and Yangn were relatively the same under different dyeing concentrations. The coefficient of variation (CV) values of Yangn were < 1.3%, the CV values of AATCC EP-6 were < 2%. Therefore, according to the consistency of the calculation, the CV values and the dependence on the concentration, the new methods of Yangn were superior to the traditional methods. Note de contenu : - EXPERIMENTAL : Materials - Dyeing - Colour measurement - RESULTS AND DISCUSSIONS : The RCS of E-type dyes - The relative colour strength of SE-type dyes - Further check - Table 2 : Dyeing concentrations of E-type and SE-type disperse dyes - Table 3 : The test conditions of colour measuring - Table 4 : Ranking of the colour strength values calculated by SWL, SUM, and WSUM - Table 5 : The relative colour strength (RCS) calculated by X-Rite Colour i7 and author for 0.1 owf (%) concentration - Table 6 : The coefficient of variation (CV) values of the relative colour strength (RCS) of the dyes produced in 2020 and 2021 calculated by AATCC EP-6 and Yangn - Table 7 : The reflectance factor values of the E-type dyes at the maximum absorption - Table 8 : The coefficient of variation (CV) values of the relative colour strength (RCS) of the E-type dyes in the range 10–25% - Table 9 : The coefficient of variation (CV) values of the relative colour strength (RCS) of the SE-type dyes produced in 2020 and 2021 at eight dye concentrations calculated by AATCC EP-6 and Yangn - Table 10 : The coefficient of variation (CV) values of the relative colour strength (RCS) of the SE-type dyes in the range 10–25% - Table 11 : The reflectance factor values of the SE-type dyes at the maximum absorption - Table 12 : The average coefficient of variation (CV) values of the relative colour strength (RCS) from the study of Part I and Part II DOI : https://doi.org/10.1111/cote.12636 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12636 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39206 [article]

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The roles of polymer relaxation phenomena, aqueous dye solubility and the physical properties of water in the mechanism of adsorption of a disperse dye on poly(ethylene terephthalate) fibres : Part 3 physical properties of water and water-derived fibre properties / Stephen M. Burkinshaw in COLORATION TECHNOLOGY, Vol. 139, N° 1 (02/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 1 (02/2023) . - p. 79-96 Titre : The roles of polymer relaxation phenomena, aqueous dye solubility and the physical properties of water in the mechanism of adsorption of a disperse dye on poly(ethylene terephthalate) fibres : Part 3 physical properties of water and water-derived fibre properties Type de document : texte imprimé Auteurs : Stephen M. Burkinshaw, Auteur ; Kangsheng Liu, Auteur Année de publication : 2023 Article en page(s) : p. 79-96 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Adsorption Colorants -- Solubilité Dynamique moléculaire Relaxation moléculaire Solutions aqueuses (chimie) Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : In the absence of published information regarding the temperature dependency of water-derived poly(ethylene terephthalate) fibre properties, the findings reported for the thermally regulated interactions between water and 100% amorphous poly(ethylene terephthalate) materials were interpreted from the perspective of the amorphous domains that reside within semi-crystalline polyester textile fibres. This analysis suggests that the pronounced temperature dependent uptake of a commercial grade disperse dye on poly(ethylene terephthalate) fabric achieved during an aqueous dyeing process at temperatures between 30 and 130°C is the likely result of the combination of three separate, but inherently inter-related, thermally activated phenomena, namely, polymer structural relaxation, in which polymer glass transition assumes a dominant role, dissolution of disperse dye in the aqueous dyebath, as well as various water–fibre interactions, in the guise of water sorption, water molecule diffusivity, water-induced swelling and water-induced plasticisation. Although thermally regulated macromolecular relaxation processes adopt the principal role in dye uptake, temperature dependent dye solubility and water-derived fibre properties nevertheless likely provide crucially important supportive roles. Note de contenu : - WATER : Water saturation vapour pressure - POLY(ETHYLENE TEREPHTHALATE) FIBRES : Water-PET polymer interactions - CONTRIBUTION OF WATER-DERIVED FIBRE PHYSICAL PROPERTIES TO DYE UPTAKE : Combination of dye solubility and water-derived fibre properties - Table 1 : Saturation moisture regain of some textile fibres DOI : https://doi.org/10.1111/cote.12635 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12635 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39207 [article]

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Ultrasound-assisted enzymatic scouring of jute optimised by response surface methodology and its natural dyeing / Harshal Patil in COLORATION TECHNOLOGY, Vol. 139, N° 1 (02/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 1 (02/2023) . - p. 97-108 Titre : Ultrasound-assisted enzymatic scouring of jute optimised by response surface methodology and its natural dyeing Type de document : texte imprimé Auteurs : Harshal Patil, Auteur ; Sahil Mudaliar, Auteur ; Ashok Athalye, Auteur Année de publication : 2023 Article en page(s) : p. 97-108 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Décapage Fibres textiles -- Lavage Jute et constituants Le jute est une plante herbacée de la famille des Malvacées, cultivée dans les régions tropicales pour ses fibres. Jute est aussi le nom donné à ces fibres textiles, appelées aussi chanvre de Calcutta. Nom scientifique : Corchorus capsularis L., famille des Malvacées, sous-famille des Grewioideae ; la classification classique le situe dans la famille des Tiliacées. Une plante voisine, Corchorus olitorius L., la corète potagère, est aussi utilisée aux mêmes fins. Surfaces de réponse (statistique) Teinture -- Fibres textiles Traitement enzymatique Ultrasons Index. décimale : 667.3 Teinture et impression des tissus Résumé : India is the largest producer of jute in the world and the use of this natural fibre in various value-added applications is gaining momentum. The use of white biotechnology involving enzymes for the efficient processing of jute is considered to boost its productivity. The present investigation deals with the pretreatment of jute by using ultrasound-assisted enzymatic scouring followed by bleaching and dyeing. The process showed optimum removal of impurities and improved water absorption capacity with minimal damage to fibre tensile strength. The process parameters and conditions were determined by response surface methodology, where weight loss of jute was kept as the main response. The optimised recipe obtained was 2.8% enzyme concentration, 1 g/L wetting agent at 55°C for 10 minutes at an ultrasound frequency of 40 kHz. The optimised recipe was compared with conventional high-temperature long-duration enzymatic scouring and was found to have an equal performance. Further, the scoured jute was dyed with a natural dye extracted from sappan wood and madder. Fourier Transform-infrared analysis was used for characterisation. The wash and light fastness of dyed jute yarn were evaluated and found to meet the industry norms. Note de contenu : - Optimisation of ultrasonic enzymatic scouring conditions using response surface methodology - Regression analysis - Response surface plot - Optimisation of responses - Pretreatment performance : Effect of pretreatment on the properties of jute yarn - Dyeing performance : Effect of pretreatments on the natural dyeing performance of jute yarn - Structural characteristics of scoured jute - Table 1 : Process parameters with range for the ultrasonic enzymatic scouring of jute yarn - Table 2 : Design matrix of experiments for the enzymatic scouring of jute - Table 3 : ANOVA model results of ultrasonic enzymatic scouring for jute yarn - Table 4 : Ranges of process parameters and their outputs - Table 5 : Pretreatment performance of jute yarn enzymatic scouring with ultrasound and conventional methods - Table 6 : Pictures of scoured, bleached and dyed jute yarn - Table 7 : Dyeing performance of jute yarn enzymatic scouring with ultrasound and conventional methods - Table 8 : Fastness performance of jute yarn enzymatic scouring with ultrasound and conventional methods DOI : https://doi.org/10.1111/cote.12638 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12638 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39208 [article]

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Determining the effect of enzymatic pretreatment on the low temperature dyeability of polyamide fabrics in COLORATION TECHNOLOGY, Vol. 139, N° 1 (02/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 1 (02/2023) . - p. 109-116 Titre : Determining the effect of enzymatic pretreatment on the low temperature dyeability of polyamide fabrics Type de document : texte imprimé Année de publication : 2023 Article en page(s) : p. 109-116 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Basses températures Colorants -- Adsorption Colorants métalliques Complexes métalliques Elasthanne Fourier, Spectroscopie infrarouge à transformée de Microscopie électronique à balayage Polyamide 6 Résistance à l'abrasion Résistance à l'éclatement Résistance au lavage Solidité de la couleur Teinture -- Fibres textiles synthétiques Traitement enzymatique Tricot Index. décimale : 667.3 Teinture et impression des tissus Résumé : In this study, by pretreating polyamide 6/elastane knitted fabrics with serine-type protease enzyme, the aim was to reduce dyeing temperatures. It is known that the elasticity of elastane fibres is damaged in dyeing at high temperatures. On the other hand, to enable efficient dyeing, it is necessary to use boiling temperatures in synthetic fibres such as polyamide, or even mild high temperature conditions, to support more uniform dyeing. Protease enzymes are enzymes that hydrolyse amide bonds, and consequently, new amine and carboxyl groups are released in fibre macromolecules, resulting in an increase in the functional group content to which anionic dyes can bind. In this study, to compensate for the loss of colour yield caused by lowering the dyeing temperature, an increase in the functional groups was provided by enzymatic pretreatment. For this purpose, the fabrics were pretreated with a commercial serine-type protease enzyme then dyed with 1:2 metal complex dyes at different temperatures. The effects of enzymatic pretreatment on colour, fastness, fibre surface characteristics and fabric strength were investigated. Note de contenu : - Enzymatic pretreatment - Determination of dye uptake values - Determination of colour yield and CIELab values - Determination of colour fastness to washing - Determination of colour fastness to rubbing - Bursting strength - Fourier Transform-infrared spectroscopy analysis - Scanning electron microscopy analysis - Table 1 : Analysis of variance results related to the effects of dyeing temperature, enzymatic process and dye type on the colour yield - Table 2 : Scanning electron microscopy photographs of enzymatically treated and untreated samples (x 2000 magnification) - Table 3 : Washing and water fastness values of dyeing - Table 4 : Acidic and alkali perspiration fastness values of dyeing - Table 5 : Dry and wet rubbing fastness values of dyeing DOI : https://doi.org/10.1111/cote.12637 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12637 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39209 [article]

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A method to improve the performance of wide dye concentration measurement based on the multi-pathlength spectrophotometry / Jianxin Zhang in COLORATION TECHNOLOGY, Vol. 139, N° 1 (02/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 1 (02/2023) . - p. 117-127 Titre : A method to improve the performance of wide dye concentration measurement based on the multi-pathlength spectrophotometry Type de document : texte imprimé Auteurs : Jianxin Zhang, Auteur ; Zhang Kangping, Auteur ; Huang Xuejiao, Auteur Année de publication : 2023 Article en page(s) : p. 117-127 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bains de teinture -- Analyse Bleu (couleur) Colorants Jaune Mesure Violet Index. décimale : 667.3 Teinture et impression des tissus Résumé : Accurate measurement of dye concentration in a dyebath is a basic step for dyeing process control and dyebath reuse. The dyebath usually covers a wide concentration range. In this article, a method based on multi-pathlength spectroscopy was proposed to improve the test performance for wide dye concentration. Partial least squares regression (PLSR) models were constructed on the combined pathlength spectra and evaluation metrics coefficient of determination (R2) and root mean square error (RMSE) were adopted for performance comparison. Results of the single-component experiment at different pathlengths (10, 5, 3, 2 and 1 mm) showed that for CI Acid Violet 54 and CI Acid Blue 113 the introduction of spectra at the 5 mm pathlength yielded greater performance. Further additions of lower pathlengths spectra were not as favourable as that of the 5 mm pathlength spectra for the models based on 10 mm spectra. While the upper concentration limits for three dyestuffs were raised to 0.50 g/L and 5 and 10 mm pathlengths were selected for further analysis, results demonstrated that the introduction of spectra at the 5 mm pathlength generally promoted the test performance for all three dyestuffs. Based on the results of single-component experiment, 10 and 5 mm pathlengths were eventually decided as the detection pathlengths for three-component solutions, and the concentration ranges of CI Acid Yellow 117, CI Acid Violet 54 and CI Acid Blue 113 were 0.03–0.48, 0.03–0.48 and 0.02–0.40 g/L, respectively. Results of three-component experiments suggested that evaluation metrics for the three dyestuffs were raised from 0.409, 0.409 and 0.980 to 0.957, 0.992 and 0.998, respectively, by the multi-pathlength spectroscopy technique. Note de contenu : MATERIALS AND METHODS : Dyestuffs - Instruments - Methods RESULTS AND DISCUSSION : Dye concentration measurement of single-component solutions - Dye concentration measurement of three-component mixed solutions - Table 1 : Abbreviations of combined pathlength - Table 2 : Test results for solutions of CI Acid Yellow 117 - Table 3 : Test results for solutions of CI Acid Violet 54 - Table 4 : Test results for solutions of CI Acid Blue 113 - Table 5 : Concentration levels of the three-component solutions - Table 6 : Test results for three-component solutions based on P2 DOI : https://doi.org/10.1111/cote.12640 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12640 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39210 [article]

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